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From "Arina Ielchiieva (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-6575) Add store.hive.conf.properties option to allow set Hive properties at session level
Date Mon, 02 Jul 2018 16:39:00 GMT
Arina Ielchiieva created DRILL-6575:
---------------------------------------

             Summary: Add store.hive.conf.properties option to allow set Hive properties at
session level
                 Key: DRILL-6575
                 URL: https://issues.apache.org/jira/browse/DRILL-6575
             Project: Apache Drill
          Issue Type: Improvement
    Affects Versions: 1.13.0
            Reporter: Arina Ielchiieva
            Assignee: Arina Ielchiieva
             Fix For: 1.14.0


*Use case*

Hive external table ddl:
{noformat}
create external table my(key int, val string)
row format delimited
fields terminated by ','
stored as textfile
location '/data/my_tbl';
{noformat}

Path {{/data/my_tb}} contains sub directory and file in it: {{/data/my_tbl/sub_dir/data.txt}}
with the following data: 
{noformat}
1, value_1
2, value_2
{noformat}

When querying such table from Hive, user gets the following exception:
{noformat}
Failed with exception java.io.IOException:java.io.IOException: Not a file: file:///data/my_tbl/sub_dir
{noformat}

To be able to query this table user needs to set two properties to true: {{hive.mapred.supports.subdirectories}}
and {{mapred.input.dir.recursive}}.
They can be set at system level in hive-site.xml or at session in Hive console:
{noformat}
set hive.mapred.supports.subdirectories=true;
set mapred.input.dir.recursive=true;
{noformat}

Currently to be able to query such table from Drill, user can specify this properties in Hive
plugin only:
{noformat}
{
  "type": "hive",
  "configProps": {
    "hive.metastore.uris": "thrift://localhost:9083",
    "hive.metastore.sasl.enabled": "false",
    "hbase.zookeeper.quorum": "localhost",
    "hbase.zookeeper.property.clientPort": "5181",
    "hive.mapred.supports.subdirectories": "true",
    "mapred.input.dir.recursive": "true"
  }
  "enabled": true
}
{noformat}

*Jira scope*
This Jira aims to add new session option to Drill {{store.hive.conf.properties}} which will
allow user to specify hive properties at session level. 
User should write properties in string delimiter by new line symbol. Properties values should
NOT be set in double-quotes or any other quotes otherwise they would be parsed incorrectly.
Key and value should be separated by {{=}}. Each `alter session set` will override previously
set properties at session level. If during query Drill couldn't unparse property string, warning
will be logged. Properties will be parsed by loading into {{java.util.Properties}}.

Example:
{noformat}
alter session set `store.hive.conf.properties` = 'hive.mapred.supports.subdirectories=true\nmapred.input.dir.recursive=true'";
{noformat}



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